JP2539517B2 - Communication control method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control method of a communication system for connecting computer systems to each other for communication, and particularly to speeding up data transfer between a computer and a communication control device. And a communication control method suitable for improving efficiency.

[Conventional technology]

As a data transfer method between a computer and a communication control device in a communication system for connecting and communicating between conventional computer systems, a text read command from the computer causes the communication control device to receive a received text frame stored in a data storage unit. A general method is to send all the data to the computer from the beginning, and the method of deleting unnecessary data due to the type of text and the like is performed after the computer reads from the communication control device.

[Problems to be Solved by the Invention]

The above-mentioned conventional technology does not consider speeding up and efficiency improvement in a data transfer method between a computer and a communication control device of a communication system that connects computer systems to each other and performs communication. There was a problem in terms of responsiveness.

An object of the present invention is to provide a communication control method that eliminates the above-mentioned drawbacks of the conventional technology.

[Means for solving the problem]

A feature of the present invention for achieving the above object is that a communication control device that receives text data from another communication control device stores the received text data in the data storage unit and issues a read request to the computer. Issued, the computer issues a text read command provided with offset word number information and read word number information to the communication control device, the communication control device receives and interprets the command, and stores it in the data storage unit. In the received text data, only the data in the designated area of the computer is sent to the computer.

[Action]

According to the above means, when the text data is received from another communication control device, the offset word number information and the read word number information provided in the text read command issued from the computer to the communication control device and the command provided in the communication control device are set. By interpreting and sending only the data of the designated area in the received text frame stored in the data storage unit to the computer, the communication control device responds to the read request of the arbitrarily designated area in the received text frame from the computer. Can select only data in an arbitrarily designated area from the received text frames stored in the data storage unit and send it to the computer.

〔Example〕

One embodiment of the present invention is shown in FIG. 1, FIG. 2, FIG. 3, and FIG.
This will be described with reference to FIGS.

Figure 1 is a block diagram showing the whole, and the computer 1 ₁ to 1 _n and the communication control device 2 ₁ to 2 _n, the computer 1 ₁ to 1 _n and the communication control device
2 _{1 to} 2 _n Computer interface bus to connect to 3 _{1 to} 3 _n
A communication line 4 connects each of the computer systems configured by and the computer systems. With such a configuration, a communication system for communicating between the computer systems is formed.

It is assumed that the communication control devices 2 ₁ to 2 _n here have functions of controlling data transfer with the computers 1 ₁ to 1 _n and controlling text transmission / reception with the communication line 4.

In addition, as the control at the time of receiving text, after receiving text and storing it in the reception buffer, issue status information and read request interrupt as necessary such as text type and total number of received text data N _T to the computer side, Report text reception, read command from computer and data transfer area on computer, offset word number N _O , read word number
Read commands such as N _R, etc. are received and interpreted, and only specified data is sent to the computer.

According to the above conditions, the block diagram in the communication control unit of the computer system of FIG. 2, the text read command format from the computer of FIG. 3, and the text frame reception buffer format in the communication control unit of FIG. The detailed circuit configuration and operation will be described with reference to the communication control processing flow chart in the text reception in the communication control apparatus of FIGS.

Here, it is assumed that the communication control device 2 ₁ receives text.

In the block diagram of FIG. 2, the computer interface bus 3 ₁ is connected to the computer-side control unit 8, the communication line 4
Is connected to the communication line controller 9. The computer side control unit 8 and the communication line side control unit 9 are connected to the arithmetic processing unit 5 via an internal interface bus 10. The arithmetic processing unit 5 includes a program storage unit 6 and a data storage unit 7 other than this.
Is also connected via the internal interface bus 10. The above is the communication control device 2 ₁ of the configuration of the computer system of FIG. 2.

Communication control device for computer system 2 ₁
Is the transmission command command and sending data from the computer 1 ₁ via a computer interface bus 3 ₁ received by the computer-side control unit 8, report to the processor 5 via the internal interface bus 10.

The arithmetic processing unit 5 uses a program storage unit 6 in which a program for performing a predetermined transmission control process is stored in advance and a data storage unit 7 for temporarily storing transmission / reception data, and interprets the transmission command command and transmits the transmission data. Format conversion is performed, and the communication line side control unit 9 is used to convert to a predetermined timing and format.
Send as send text to.

On the other hand, the text received from the communication line 4 is received by the communication line control unit 9, converted into a predetermined timing and format, and reported to the arithmetic processing unit 5 via the internal interface bus 10. The arithmetic processing unit 5 stores the received text in the reception buffer of the data storage unit 7 according to a program for performing a predetermined reception control process stored in the program storage unit 6 in advance. Computer-side control unit 8, the computer interface bus 3 ₁ via the computer 1 ₁
Text type and issue the received text data the total number N _T status information and read request interrupt as needed, such as, report the text received in the computer 1 _1. Also a calculator
1 Data transfer area of the read command and the computer 1 ₁ from _1, received by the offset word number N _O, read word number N commands corresponding to the needs of _R or the like via a computer interface bus 3 ₁ computer-side control unit 8, It reports to the arithmetic processing unit 5 via the internal interface bus 10. The arithmetic processing unit 5 interprets the read command by a program which is stored in the program storage unit 6 and which performs a communication control process at the time of receiving a predetermined text, and the received text stored in the reception buffer of the data storage unit 7. Only the data in the area designated by the offset word number N _O by the read command and the read word number N _T in the frame is sent to the computer 1 ₁ via the internal interface bus 10, the computer side control unit 8, and the computer interface bus 3 _1. .

In Figure 3, shows the text read command format diagram issued from another communication control device at the time of text received transmission, from the computer 1 ₁ to the communication control device 2 _1.

Address m and address n in the read command format are provided with offset word number information N _O and read word number N _R , respectively.

In Figure 4, at the time of transmission text received from another communication control device, the communication control device 2 ₁ shows a text frame receiving buffer format diagram stored in the reception buffer in the data storage unit 7.

From the received text data the total number N _T in the receive buffer by interpreting the offset number of words N _O and read word number N _R of the text read command the computer 1 ₁ issues the communication control device, the receiving buffer address N _O +1
~ Only the text data N _O +1 to the text data N _O + N _R stored in the receive buffer address N _O + N _R is calculated by the computer 1 ₁
Can be sent to

Figure 5 shows the communication control process flow diagram during text reception of the communication control device 2 in ₁ showing an embodiment of the.

At first, it is in a state of waiting for receiving a text from another communication control device, and confirms whether or not the text is received.

If the text is received, stores the received text to the receive buffer, the communication control device 2 _1, text to the computer 1 ₁ type and receiving text data the total number N _T status information and read request interrupt as needed, such as issue the reports the text received, the read command waiting state from the computer 1 _1.

If the read command is received, the read command and offset number of words N _O from the computer 1 _1, the interpretation of the read command as needed, such as read word number N _R performed. Then, the offset number of words in the case of N _O ≠ 0, is set to the delivery address register sending start address N _O +1 of the receive buffer. If offset number of words of N _O = 0, sets the delivery address register delivery head address 1 of the receive buffer. The number of read words N _R is set in the transmission count register.

After this processing, the data at the address indicated by the receive buffer address according to the contents of the sending address register is sent, and the contents of the sending address register after sending is updated by +1.
Then, the content of the transmission count register is updated by -1. It can be transmitted only data of the specified area from the computer 1 ₁ By repeating until this operation the contents of the delivery count register becomes zero.

According to this embodiment described above, since it is possible to handle only the data needed by the type or the like of text computer 1 _1, the speed and responsiveness of the communication system to connect the computing system mutually perform communication A communication control method that can be improved and that eliminates the drawbacks of the prior art can be realized.

〔The invention's effect〕

According to the present invention, with a simple circuit configuration and a communication program at the time of receiving a text read command, in data transfer between a computer and a communication control device, it is possible to handle only data as necessary depending on the type of text and the like. The data transfer time can be shortened, and the unnecessary data deletion processing performed after the computer has read from the communication control device is not required, and the high speed and responsiveness of the communication system for connecting the computer systems to each other for communication can be improved. it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram, FIG. 2 is a block diagram of a communication control device of the computer system of FIG. 1, FIG. 3 is a text read command format diagram from a computer, and FIG. 4 is a text frame reception in the communication control device. FIG. 5 is a buffer format diagram, and FIG. 5 is a flow chart of communication control processing at the time of text reception in the communication control device. 1 ₁ to 1 _n ... computer, 2 ₁ to 2 _n ... communication control device, 3 _{1 to} 3 _n ...
… Computer interface bus, 4 …… communication line, 5…
... arithmetic processing unit, 6 ...... program storage unit, 7 ...... data storage unit, 8 ...... computer-side control unit, 9 ...... communication line side control unit, 10 ...... internal interface bus, N _O ...... offset number of words, N _R …… Number of read words, N _T …… Total number of received text data.

Claims (2)

(57) [Claims] 1. A text of a computer, a program storage unit for storing a predetermined program, a data storage unit for temporarily storing transmission / reception data and control information, and a computer side control unit for controlling data transfer between the computer and another computer system. In a communication system that communicates by connecting a communication line side control unit that controls transmission and reception and a communication control device that is composed of an arithmetic processing unit that collectively controls these by a computer interface bus, text data from another communication control device The communication control device that has received the information stores the received text data in the data storage unit, issues a read request to the computer, and the computer provides the communication control device with offset word number information and read word number information. Issuing a text read command, the communication control device receives and interprets the command, A communication control method characterized by sending only the serial data in the specified area of the computer in the received text data stored in the data storage unit to the computer. 2. A communication control program according to claim 1, comprising a program for interpreting a text read command from the computer and transmitting only data in a designated area of a received text frame stored in the data storage unit to the computer. A communication control method comprising storing the program in the program storage unit.